Re: [poky] Compiling Poky with Clang and Clang Coverage Flags

Can you try something like this

*TARGET_CPPFLAGS:prepend:class-target:toolchain-clang =
"-fprofile-instr-generate -fcoverage-mapping "*




On Mon, Apr 22, 2024 at 3:42 AM Hope Sneddon via lists.yoctoproject.org
<[email protected]> wrote:

> 
>
> Hi Poky Community,
>
>
>
> I am trying to build a Yocto code base using Clang and LLVM as the default
> toolchain (i.e. nonclangables still compile with GCC) as per the “Using
> Clang Compiler with Yocto Project” presentation instructions
> <https://elinux.org/images/f/ff/Yps2021.11-clang.pdf>. The issue is I
> need to compile with code coverage via the Clang coverage flags which do
> not seem to work with Yocto/ Poky by default. I have simplified my
> application all the way back to a freshly cloned Poky repo with only the
> following changes to reproduce the error, proving it is not a problem
> caused by custom configurations/ use case development.
>
>
>
> That is, to show the issue, in a fresh clone of Poky, the following lines
> are added to *local.conf*:
>
> *TOOLCHAIN = "clang"*
>
> *TARGET_CPPFLAGS:prepend = "-fprofile-instr-generate -fcoverage-mapping "*
>
> *RUNTIME = "llvm"*
>
> *CLANGSDK = "1"*
>
>
>
> Simple Clang compilation of Poky works, however I need to compile with
> code coverage which doesn’t seem to currently work by default (i.e. add the
> Clang coverage flags in *local.conf* using *TARGET_CPPFLAGS:prepend =
> "-fprofile-instr-generate -fcoverage-mapping "*).
>
>
>
> To demonstrate this I have implemented a simple “hello-world” recipe as *hello-world_1.0.0.bb
> <http://hello-world_1.0.0.bb>* (extract below excludes recipe header
> lines):
>
> *S = "${WORKDIR}/${PN}-${PV}"*
>
>
>
> *python do_hello_world(){*
>
> *    print("Hello World\n")*
>
> *}*
>
>
>
> *addtask do_hello_world*
>
>
>
> Compiling this via the command *bitbake hello-world* fails.
>
>
>
> Failure is caused by the *do_compile *step to failing due to *oe_runmake*
> failing:
>
> *ERROR: gcc-cross-x86_64-11.4.0-r0 do_compile: oe_runmake failed. *
>
>
>
> The log data from *oe_runmake* indicates the failure is induced at the
> following *oe_runmake* step (log output):
>
> *checking for suffix of object files... configure: error: in
> `/home/dev/poky/build/tmp/work/x86_64-linux/gcc-cross-x86_64/11.4.0-r0/gcc-11.4.0/build.x86_64-linux.x86_64-poky-linux/x86_64-poky-linux/libgcc':*
>
> *| configure: error: cannot compute suffix of object files: cannot compile*
>
>
>
> The failure of gcc_cross does not seem to be representative of the actual
> root of the issue, so debugging this is proving difficult. Any guidance on
> how to get Clang coverage working would be greatly appreciated as my
> application requires the employment of a lot of the llvm-cov toolset (the
> motivation for substituting compiler in the first place).
>
>
>
> Thank you,
>
>
>
> Hope
>
>
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